Downhole milling tool and cutter therefor

Details Downhole milling tool and cutter therefor Downhole milling tool and cutter therefor

E - Fixed Constructions

21

B

166/15

E21B 10/26 (2006.01) E21B 10/32 (2006.01) E21B 10/46 (2006.01) E21B 29/00 (2006.01)

Patent

CA 2010796

A cutter for a downhole milling or cutting tool and a tool incorporating the blade has a longitudinal axis (97) about which the tool is rotatable. The tool may have a plurality of circumferentially disposed blades which are either fixed or radially movable to perform a cutting operation. Each of the cutters has a blade (100) having a cutting surface (17) which is formed by a plurality of cutting elements (20). Each of the cutting elements has a plurality of protruding cutting edges (3) each of which are longitudinally spaced from one another and interspaced from one another by a recess portion (1) so that in use swarf moves upwardly from one of the cutting edges along the recess portion and is subsequently broken off. By providing such relatively closely spaced cutting edges generally C-shaped swarf cuttings are produced and "birdnesting" is substantially reduced or eliminated. The cutting elements each have a cutting surface (41) which presents a negative radial rake angle in the range 1-10° and a lead attack angle in the range1-15°.

Taillant pour un outil de forage fond-de-trou ou un outil de coupe, et outil intégrant la lame qui comporte un axe longitudinal (97) autour duquel l'outil peut tourner. L'outil peut posséder un certain nombre de lames disposées sur sa circonférence, qui sont soit fixes, soit mobiles dans le sens radial afin de couper. Chaque taillant possède une lame (100) dotée d'une surface de coupe (17) formée d'un certain nombre d'éléments de coupe (20). Chaque élément de coupe comporte un certain nombre de bords coupants en saillie (3) qui sont espacés longitudinalement et séparés les uns des autres par un évidement (1) de sorte que pendant l'utilisation les copeaux vont vers le haut à partir d'un bord coupant le long de l'évidement et sont ensuite détachés. A cause des bords coupants relativement peu espacés, des copeaux généralement en forme de C sont produits, ce qui réduit fortement, sinon élimine l'accumulation de ces copeaux. Les éléments de coupe ont chacun une surface de coupe (41) qui présente un angle de coupe radial négatif de l'ordre de 1 à 10 degrés et un angle d'avance de l'ordre de 1 à 15 degrés.

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